Glatiramer acetate
Multiple sclerosis disease-modifying therapies
Multiple sclerosis disease-modifying therapies
A random polymer of four amino acids injected under the skin for relapsing multiple sclerosis; it shifts immune cells away from attacking myelin.
Quick facts
- Group
- Multiple sclerosis disease-modifying therapies
- Target
- MHC class II molecules and myelin-reactive T cells (immunomodulation)
- Used for
- Relapsing forms of multiple sclerosis
- Key effects
- Injection site reactions · Flushing · Chest pain
- Monitor
- Injection sites · Signs of anaphylaxis or liver injury
- ATC
- L03AX13
No doses: the clinician sets them by the current guideline.
Mechanism of action
Glatiramer acetate is a mixture of random polypeptides made of L-glutamic acid, L-alanine, L-tyrosine and L-lysine. It binds MHC class II molecules efficiently and induces cross-reactive CD4 T cells that secrete anti-inflammatory TH2 cytokines such as IL-4 and IL-13. These cells damp inflammation in the brain and spinal cord, reducing relapses and new MRI lesions. The exact mechanism is not fully understood.
- Glatiramer binds MHC class II molecules
- Cross-reactive CD4 T cells switch to an anti-inflammatory TH2 profile
- Inflammation in the CNS is damped
- Fewer relapses and new lesions
Indications
- Relapsing forms of multiple sclerosis in adults Multiple sclerosis →
Adverse effects
Common
- Injection site reactions (redness, pain, swelling, itching)
- Flushing (vasodilatation), rash and shortness of breath
- Chest pain, usually brief
Contraindications
- Hypersensitivity to glatiramer acetate or mannitol
Key interactions
- Optional autoinjector devices
- An incompatible device can cause missed or partial doses; each product has its own compatible device
What is monitored
- Injection sites (rotation, lipoatrophy, necrosis)
- Signs of anaphylaxis or liver injury
- Relapses and MRI activity
Administration and safety
- Subcutaneous injection; sites are rotated to prevent lipoatrophy
- The patient or caregiver is trained in injection technique
- Only an autoinjector labelled as compatible with that specific product is used
Pregnancy and breastfeeding
Decades of pregnancy data have not shown a drug-associated risk of major birth defects or miscarriage.
Nursing care
- Teach injection technique and site rotation
- Explain the immediate post-injection reaction and how it differs from anaphylaxis (which needs emergency care)
- Teach signs of liver problems: jaundice, dark urine, nausea
Pharmacokinetics
- Absorption
- Subcutaneous injection; a substantial fraction is hydrolyzed locally at the injection site
Test yourself
Think of the answer, then tap the question to see it.
What is glatiramer acetate made of?
Random polypeptides of L-glutamic acid, L-alanine, L-tyrosine and L-lysine.
What happens in the immediate post-injection reaction?
Flushing, chest pain, palpitations, anxiety or throat tightness within minutes, usually brief and self-limited.
Why are injection sites rotated?
To reduce lipoatrophy and skin necrosis.
Connections
← Back to the class: Multiple sclerosis disease-modifying therapies
Educational content on how drugs work; not a prescribing guide and no substitute for a health professional's advice. No doses are given.
Sources: DailyMed - GLATIRAMER ACETATE injection, solution (DailyMed (U.S. National Library of Medicine), 2026); Glatiramer Injection: MedlinePlus Drug Information (MedlinePlus (U.S. National Library of Medicine), 2026); eEML - Electronic Essential Medicines List (World Health Organization, 2025).
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Representative model, for educational purposes only.